Tire pump



r Mams, 1923.

1,455,584 y H. GRAHAMA I A TIRE PUMP Filed Aug. 5. 1921 Patented May 15,1923.

HOWARD GRAHAM, or KNIPPA, rnzrns.

TIRE Pinar'.

` Application mea august 3.1921.' seran Nq. 489,495.

To all fav/'wm t may concern:

Be it known that I, HOWARD GRAHAM, al

citizen of 'the United States, residingl at Knippa, in the county of Uvalde and State of Texas, have invented certain newan'd useful Improvements in Tire Pumps; and l do hereby declare the following to bea full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to makeand use the same. l j y This invention relates to new and useful improvements in tire pumps and has for its primary object the provision of a piston adapted to perform its usual function of an air compressing medium and also adaptedto act as a valve between the air inlet and the terto receive its full amount of air on the non-working stroke of the piston, consequently obviating the employment of the usual check valve for such a purpose.

Another object of this invention is the provision of a tire pump of the above stated character which will be simple, durable and elicient, and which may be manufactured and sold at a comparatively lowcost.

With these and other objects in view,as will become more apparent as the description proceeds, the invention consists in certain novel features of construction, combination, and arrangement of parts as will be hereinafter more fully described and claimed.

For a complete understanding of my invention, reference is to be had to the folo lowing description and accompanying drawing, in which Figure 1 is a vertical sectional view illustrating a tire pump constructed in accordance with my invention,

. Figure 2 is an enlarged vertical sectional View illustrating the piston and its connection `with the piston stem or rod,

Figure 3 is an end view illustrating one end of the pistonhead.

Referring in detail to the drawings, the

numeral 1 indicates la cylindery which hasy each end externally screw threaded and `one end isv threaded in an annular iiange 2f formed upon a base 3 of the usual construction. The base 3 projects beyond the cylinder 1 for the purpose of forming a foot rest.

A cap 4 closes the other end of the cylinderV 1 by being threadedthereto and is provided with a centrally arranged opening to receive a piston stem'or rod 5.

TheI stern or rod 5 has itsn'upperend rei 'duced and provided with a removable handle 6 andthe latter'is retained'onthestem or rod 5 by anuty 7.- The cylinder 1 AAadjafl cent to the closure cap 4 isfprov'ided with the usual vent opening i.

[The stem or rod 5-has its lower portion reduced to `form an extension 9 and aconical shaped portion 10 between said extension Q'and the rod or stem 5. Apiston` head is retained' thereon by means of a'` nut 12 threaded to the end of the extension -`9 and held thereon against accidental displacement y11 is-slidably mounted on the extension 9 and by a cotter key 13. A ywasherliV is po'sif tionedb'etween the nut 12 `and the lower end of the piston head 11. The `nut 12 andits 'washer 14 is adapted to limitthe movement .l

of the 'head 11v in one direction, v,while the conical portion'plOl ofthe stem or rod L5 ,is

adapted to llimit'the movement .of the head in an opposite direction and formv a seat therefor. The lower portion of the vhead 11- y contacts .with the wall of the" cylinder 1 while the upper portion is slightlyreduced.

as illustrated at 15 to form an air pocket between the wall of the cylinderand said piston head. Grroovesy A.16 v.are formed in the head 1l between theflower end thereof and the pocket 15 for the purpose of permitting v air to pass the head 11 during its movement u in either direction. p

A cup-shaped washer 17 is mounted on the upper end of the head 11 andV is provided with a centrally arranged opening lto receive the piston rod-or stem 5. wear` plate 18 is mounted on the stemor rod 5 and rests upon the washer 17. Tie rods 19 pass through the wear plate 18, washer l17 and the piston head 11 and receive nuts upon'their ends. The

opening ofthe'washer 17 is of substantially conical vshape, to conform tothe conical por-l tion 10 of the piston stemk orrod 5 so that when the stem or rod is on its, downward movement, the air compressed withinthe air.

chamber or thelower portion of the cylinder' 1 will force the pistonupwardly on the eX- tension 9 which causes the washer to contact with the conical portion of thevstem or rod 5 and also with the wall of the cylinder consequently preventing the escape of air during thecompression stroke of the piston.'

On thenon-working or suction stroke -o'f the piston, the head 11 is in contactwith the washer 14 which moves the washer v17 and wear plate 18 away from the `conical portion 10 of thepiston stem or rod 5 .for the'purpose of permitting air to pass the washer -17 and the extension 9 is provided with a nattened face 2O which afford a passagewaynot only' through head 11, washer 17 and plate 18 but also through washer 14 and nut 12 permitting the passage of air between said extension and the piston head 11 so that the air vmay enter the compressing chamber from the vent opening. rlhe lower end ofthe cylinderis lequipped with a nipple 21150 which' a hose 22may be connected and the latter at its free end is provided with the V,usual valve engaging member 23 and is adapted tol be applied to the valve steino' atire in the usual `mani'ier. The base 3 is'provided with a stopQfl adapted to limit the vdownward movement of the piston stemvon rod 5.

On theworling or downstrolre .off-*the piston head 1l, a eertain' ainnintofll air Apasses throughy the grooves 16 into the air pocket 1,5 forcing thel washer 17 in contact with the y meme@ parts may be made without depart-ing from l the rvspirit and scope [off the invention as claimed.

'Having thus described my invention whatl I claim is ln combination, a piston head, said head havin@ a oclret a washer dis osed in said 1 :D

pocket, a wear ,plate on'said washer, tie

means seeuringsaidhead, washer and plate together, said. head having ,a V,peripheral groove in communication, with said pocket whereby compression may reachsaid washer, said rod having la conical seat engaffefable by said head, washerxandplate, said "rodhavn ing an extension of frediiced dianl'eter'extending romthe rustrumfof the sefat,v said extension having a side portion treduced in cross-sectional area, said plate, ywasher ,and head being slidable away `from said seat, an

element screw threaded'on'said extensionto e,

limit the latter movement, the side portion serving to provide an openingthrough said` element. l

In testimony whereof I ailix mysignature Y in presenceof two'witnes'ses'. v .Y

HOWARD GRAHAM. Witnesses: i i 'l 'Y I W. M. BRQDIE, MENA GIBnENs. 

